On our container, we want to turn off vertical scrolling (overflow-y) and enable horizontal scrolling (overflow-x). Then with each card, we want to set it to display with inline-block so they all display in a row.
The line of CSS you probably are unfamiliar with is white-space: nowrap. This property is used to control how text wraps around a container. In this case, we want to disable that wrapping by using nowrap.